Line 1, . Point 1, 1997 is 30. Point 2, 1998 is 28. Point 3, 1999 is 26. Point 4, 2000 is 26. Point 5, 2001 is 27. Point 6, 2002 is 26. Point 7, 2003 is 26. Point 8, 2004 is 23. Point 9, 2005 is 25. Point 10, 2006 is 25.
Source: Calculated by ERS based on data from government and private sources.